Element

Element is a free, open-source messaging and collaboration client built on the decentralized Matrix protocol, with end-to-end encryption, group chat, file sharing and voice/video calls. It works on web, desktop and mobile, and can be self-hosted or used on public Matrix servers.

• Open-source alternative to: Slack, Microsoft Teams
• Licence: AGPL-3.0 (Network copyleft open source)
• Website: https://element.io/
• Source code: https://github.com/element-hq/element-web
• GitHub stars: 13635, forks: 2815
• Topics: messaging, matrix, encrypted chat, collaboration, video calls, hacktoberfest